Question

This should be simple but no matter what I try I can’t get the data I want…
I have two tables:

dependent d

empID  relID      dob
100     1     8/8/1988
100     2     1/1/2001
200     1     9/9/1989

employee e

empID
100
200
300

that I need to join like so:

Desired Results (where only dobs with relID=1 are included)

e.empID  d.dob
100     8/8/1988
200     9/9/1989
300     NULL

No matter which join I use I end up with only the records that intersect (where the empID in dependent has a record with relID=1) like so:

Actual Results (see query below)

e.empID  d.dob
100     8/8/1988
200     9/9/1989


SELECT e.empID, d.dob 
FROM employee AS e LEFT OUTER JOIN dependent AS d ON e.empID = d.empID
WHERE (d.relID = 1)

What am I missing/doing wrong?

Thank you for your kind attention!

Answer 1

Make the filter part of the join condition:

SELECT e.empID, d.dob 
FROM employee AS e 
LEFT OUTER JOIN dependent AS d 
ON e.empID = d.empID
AND d.relID = 1